fix fake players

src/main/java/carpet/mixins/ServerWorld_fakePlayersDimensionChange.java

@@ -0,0 +1,37 @@
+package carpet.mixins;
+
+import carpet.patches.EntityPlayerMPFake;
+import net.minecraft.entity.Entity;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.ServerTask;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.server.world.ServerWorld;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(ServerWorld.class)
+public abstract class ServerWorld_fakePlayersDimensionChange
+{
+    @Shadow private boolean ticking;
+
+    @Shadow /*@Nonnull*/ public abstract MinecraftServer getServer();
+
+    @Redirect( method = "removePlayer", at  = @At(
+            value = "INVOKE",
+            target = "Lnet/minecraft/server/world/ServerWorld;removeEntity(Lnet/minecraft/entity/Entity;)V"
+    ))
+    private void crashRemovePlayer(ServerWorld serverWorld, Entity entity_1, ServerPlayerEntity serverPlayerEntity_1)
+    {
+        if ( !(ticking && serverPlayerEntity_1 instanceof EntityPlayerMPFake) )
+            serverWorld.removeEntity(entity_1);
+        else
+            getServer().method_18858(new ServerTask(getServer().getTicks(), () ->
+            {
+                serverWorld.removeEntity(serverPlayerEntity_1);
+                serverPlayerEntity_1.onTeleportationDone();
+            }));
+
+    }
+}

src/main/java/carpet/patches/EntityPlayerMPFake.java

@@ -59,6 +59,7 @@ public class EntityPlayerMPFake extends ServerPlayerEntity
         server.getPlayerManager().sendToDimension(new EntitySetHeadYawS2CPacket(instance, (byte) (instance.headYaw * 256 / 360)), instance.dimension);
         server.getPlayerManager().sendToDimension(new EntityPositionS2CPacket(instance), instance.dimension);
         instance.getServerWorld().method_14178().updateCameraPosition(instance);
+        instance.dataTracker.set(PLAYER_MODEL_BIT_MASK, (byte) 0x7f); // show all model layers (incl. capes)
         return instance;
     }
 
@@ -106,7 +107,7 @@ public class EntityPlayerMPFake extends ServerPlayerEntity
             this.getServerWorld().method_14178().updateCameraPosition(this);
         }
         super.tick();
-        this.method_14226();
+        if (!removed) this.method_14226();
     }
 
     @Override

src/main/resources/carpet.mixins.json

@@ -27,6 +27,8 @@
     "ServerWorld_unloadedEntityMixin",
     "MobEntity_leashMixin",
 
+    "ServerWorld_fakePlayersDimensionChange",
+
     "ServerPlayNetworkHandlerMixin",
     "MinecraftServer_scarpetMixin",
     "PlayerListHeaderS2CPacketMixin",